<template>
    <div class="sidebar">
        <!-- 默认主题：background-color="#324157" text-color="#bfcbd9" active-text-color="#20a0ff" -->
        <el-menu class="sidebar-el-menu" :default-active="onRoutes" :collapse="collapse" unique-opened router>
            <template v-for="item in items">
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.subs">
                            <el-submenu v-if="subItem.subs" :index="subItem.index" :key="subItem.index">
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item v-for="(threeItem,i) in subItem.subs" :key="i" :index="threeItem.index">
                                    {{ threeItem.title }}
                                </el-menu-item>
                            </el-submenu>
                            <el-menu-item v-else :index="subItem.index" :key="subItem.index">
                                {{ subItem.title }}
                            </el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
    import bus from '../common/bus'
    export default {
        data() {
            return {
                collapse: false,
                items: [{
                        icon: 'el-icon-lx-home',
                        index: 'dwnCenter',
                        title: '系统首页'
                    },
                    {
                        icon: 'el-icon-lx-people',
                        index: 'userInfo',
                        title: '个人中心'
                    },
                    {
                        icon: 'el-icon-lx-recharge',
                        index: 'rechargeIntegral',
                        title: '兑换中心'
                    },
                    // {
                    //     icon: 'el-icon-lx-emoji',
                    //     index: 'icon',
                    //     title: '自定义图标'
                    // },
                ]
            }
        },
        computed: {
            onRoutes() {
                return this.$route.path.replace('/', '')
            }
        },
        created() {
            // 通过 Event Bus 进行组件间通信，来折叠侧边栏
            bus.$on('collapse', msg => {
                this.collapse = msg
            })
        }
    }

</script>

<style scoped>
    .sidebar {
        display: block;
        position: absolute;
        left: 0;
        top: 70px;
        bottom: 0;
        overflow-y: scroll;
    }

    .sidebar::-webkit-scrollbar {
        width: 0;
    }

    .sidebar-el-menu:not(.el-menu--collapse) {
        width: 250px;
    }

    .sidebar>ul {
        height: 100%;
    }

</style>
